<template>
  <div class="app-container">
    <el-tree default-expand-all :data="depts" :props="defaultProps" :expand-on-click-node="false">
      <!-- 节点结构 -->
      <!-- v-slot="{ node, data }" 只能作用在template -->
      <template v-slot="{ data }">
        <el-row style="width:100%;height:40px" type="flex" justify="space-between" align="middle">
          <el-col>{{ data.name }}</el-col>
          <el-col :span="4">
            <span class="tree-manager">{{ data.managerName }}</span>
            <!-- $event 实参 表示类型 -->
            <el-dropdown @command="operateDept($event, data.id)">
              <!-- 显示区域内容 -->
              <span class="el-dropdown-link">
                操作<i class="el-icon-arrow-down el-icon--right" />
              </span>
              <!-- 下拉菜单选项 -->

              <el-dropdown-menu slot="dropdown">
                <el-dropdown-item command="add">添加子部门</el-dropdown-item>
                <el-dropdown-item command="edit">编辑部门</el-dropdown-item>
                <el-dropdown-item command="del">删除</el-dropdown-item>
              </el-dropdown-menu>
            </el-dropdown>
          </el-col>
        </el-row>
      </template>
    </el-tree>
    <add-dept ref="addDept" :title="title" :current-node-id="currentNodeId" :show-dialog.sync="showDialog" @updateDepartment="getDepartment" />
  </div>
</template>
<script>
import { delDepartment, getDepartment } from '@/api/department'
import { transListToTreeData } from '@/utils'
import addDept from './components/add-dept.vue'
export default {
  name: 'Department',
  components: { addDept },
  data() {
    return {
      title: '新增',
      currentNodeId: -1,
      depts: [],
      showDialog: false,
      defaultProps: {
        children: 'children',
        label: 'name'
      }
    }
  },
  created() {
    this.getDepartment()
  },
  methods: {
    handleNodeClick(data) {
      console.log(data)
    },
    async getDepartment() {
      const res = await getDepartment()
      this.depts = transListToTreeData(res.data, 0)
    },
    operateDept(type, id) {
      if (type === 'add') {
        this.title = '新增'
        this.showDialog = true
        this.currentNodeId = id
      } else if (type === 'edit') {
        this.title = '编辑'
        this.showDialog = true
        this.currentNodeId = id // 记录id 要用到它获取数据
        // 更新props 它是异步动作
        // 直接调了子组件的方法 他是同步的
        // 要在子组件获取数据
        // 父组件调用子组件的方法来获取数据

        this.$nextTick(() => {
          // 使用nextTick
          // 这里为什么要用$nextTick，
          // 因为弹出层之后紧接着要调用子组件方法，
          // 第一次弹出层时，里面的组件还未完成渲染，所以要等到showDialog这个属性设置的数据完成渲染之后才进行调用
          // Vue 在更新 DOM 时是异步执行的。当数据发生变化，Vue将开启一个异步更新队列，视图需要等队列中所有数据变化完成之后，再统一进行更新
          this.$refs.addDept.getDepartmentDetail() // this.$refs.addDept等同于子组件的this
        })
      } else {
        // 删除部门
        this.$confirm('您确认要删除该部门吗').then(async() => {
          await delDepartment(id)
          // 提示消息
          this.$message.success('删除部门成功')
          this.getDepartment()
        })
      }
    }
  }
}

</script>
<style scoped>
.app-container {
  padding: 30px 140px;
  font-size: 14px;
}

.tree-manager {
  width: 50px;
  display: inline-block;
  margin:10px 35px;
}
</style>
